<template>
  <div>
    <!-- seaction -->
    <!-- 购物车列表 -->
    <div class="cart">
      <h4>全部商品</h4>
      <div class="cart-main">
        <div class="cart-th">
          <div class="cart-th1">全部</div>
          <div class="cart-th2">商品</div>
          <div class="cart-th3">单价（元）</div>
          <div class="cart-th4">数量</div>
          <div class="cart-th5">小计（元）</div>
          <div class="cart-th6">操作</div>
        </div>
        <div class="cart-body">
          <ul class="cart-list" v-for="(cart, index) in cartInfoList" :key="cart.id">
            <li class="cart-list-con1">
              <input
                type="checkbox"
                name="chk_list"
                :checked="cart.isChecked == 1"
                @change="updateChecked(cart, $event)"
              />
            </li>
            <li class="cart-list-con2">
              <img :src="cart.imgUrl" />
              <div class="item-msg">
                {{ cart.skuName }}
              </div>
            </li>

            <li class="cart-list-con4">
              <span class="price">{{ cart.skuPrice }}.00</span>
            </li>
            <li class="cart-list-con5">
              <a href="javascript:void(0)" class="mins" @click="handler('minus', -1, cart)">-</a>
              <input
                autocomplete="off"
                type="text"
                value="1"
                minnum="1"
                class="itxt"
                v-model="cart.skuNum"
                @change="handler('change', $event.target.value * 1, cart)"
              />
              <a href="javascript:void(0)" class="plus" @click="handler('add', +1, cart)">+</a>
            </li>
            <li class="cart-list-con6">
              <span class="sum">¥{{ cart.skuPrice * cart.skuNum }}</span>
            </li>
            <li class="cart-list-con7">
              <a @click="deleteCartById(cart)" class="sindelet">删除</a>
              <br />
              <a href="#none">移到收藏</a>
            </li>
          </ul>
        </div>
      </div>

      <div class="cart-tool">
        <div class="select-all">
          <input
            class="chooseAll"
            type="checkbox"
            :checked="isCheckedAll && cartInfoList.length > 0"
            @click="updateAllCartChecked"
          />
          <span>全选</span>
        </div>
        <div class="option">
          <a @click="deleteAllCheckedCart">删除选中的商品</a>
          <a href="#none">移到我的关注</a>
          <a href="#none">清除下柜商品</a>
        </div>
        <div class="money-box">
          <div class="chosed">已选择 <span>0</span>件商品</div>
          <div class="sumprice">
            <em>总价（不含运费） ：</em>
            <i class="summoney">{{ totalPrice }}</i>
          </div>
          <div class="sumbtn">
            <router-link to="/trade" class="sum-btn">结算</router-link>
          </div>
        </div>
      </div>
    </div>
    <!-- 底部 -->
  </div>
</template>
<script>
import { mapGetters } from 'vuex'
import throtte from 'lodash/throttle'

export default {
  name: 'ShopCart',
  mounted() {
    this.getData()
  },
  methods: {
    // 获取个人购物车数据
    getData() {
      this.$store.dispatch('getCartList')
    },
    // 修改某个产品的数量
    // async handler(type, disNum, cart) {
    //   // type:区分 三个元素
    //   // disnum：三个变化量 1 ,-1,input的最终值（不是变化量）
    //   // cart:哪一个产品（身上有id）
    //   // 向服务器派发请求，修改参数
    //   console.log(type, disNum, cart.skuId)
    //   switch (type) {
    //     case 'add':
    //       // 带给服务器的数量的变化量
    //       disNum = 1
    //       break
    //     case 'minus':
    //       // 产品的个数大于1,才可以传递给服务器
    //       // 如果出现的产品小于等于0，传递给服务器的个数为0
    //       disNum = cart.skuNum > 1 ? -1 : 0
    //       break
    //     case 'change':
    //       if (isNaN(disNum) || disNum < 0) {
    //         disNum = 0
    //       } else {
    //         disNum = parseInt(disNum) - cart.skuNum
    //       }
    //       break
    //   }

    //   try {
    //     await this.$store.dispatch('addOrUpdateShopCart', { skuId: cart.skuId, skuNum: disNum })
    //     this.getData()
    //   } catch (error) {
    //     alert(error.message)
    //   }
    // },
    handler: throtte(async function (type, disNum, cart) {
      console.log(type, disNum, cart.skuId)
      switch (type) {
        case 'add':
          // 带给服务器的数量的变化量
          disNum = 1
          break
        case 'minus':
          // 产品的个数大于1,才可以传递给服务器
          // 如果出现的产品小于等于0，传递给服务器的个数为0
          disNum = cart.skuNum > 1 ? -1 : 0
          break
        case 'change':
          if (isNaN(disNum) || disNum < 0) {
            disNum = 0
          } else {
            disNum = parseInt(disNum) - cart.skuNum
          }
          break
      }

      try {
        await this.$store.dispatch('addOrUpdateShopCart', { skuId: cart.skuId, skuNum: disNum })
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    }, 1000),
    // 删除某一个产品的操作

    async deleteCartById(cart) {
      try {
        await this.$store.dispatch('deleteCartListBySkuId', cart.skuId)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //修改选中状态
    updateChecked(cart, event) {
      // console.log(cart, $event)
      // 带给服务器的isChecked 不是布尔值，
      try {
        // 修改成功，再次获取服务器数据
        let isChecked = event.target.checked ? '1' : '0'
        this.$store.dispatch('updateCheckedById', { skuId: cart.skuId, isChecked })
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    // 删除全部选中的商品
    async deleteAllCheckedCart() {
      try {
        await this.$store.dispatch('deleteAllCheckedCart')
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    // 修改全选
    async updateAllCartChecked(event) {
      try {
        let isChecked = event.target.checked ? '1' : '0'
        // 派发action
        await this.$store.dispatch('updateAllCartIsChecked', isChecked)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
  },
  computed: {
    ...mapGetters(['cartList']),
    cartInfoList(state) {
      return this.cartList.cartInfoList || []
    },
    totalPrice() {
      // 总计价钱
      let sum = 0
      this.cartInfoList.forEach((cart) => {
        sum += cart.skuPrice * cart.skuNum
      })
      return sum
    },
    // isChecked 全选
    isCheckedAll() {
      // 遍历数组里，只要全部元素isChecked 为1 就返回true
      return this.cartInfoList.every((item) => item.isChecked == 1)
    },
  },
}
</script>
<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }
  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;
      & > div {
        float: left;
      }
      .cart-th1 {
        width: 25%;
        input {
          vertical-align: middle;
        }
        span {
          vertical-align: middle;
        }
      }
      .cart-th2 {
        width: 25%;
      }
      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }
    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;
      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;
        & > li {
          float: left;
        }
        .cart-list-con1 {
          width: 15%;
        }
        .cart-list-con2 {
          width: 35%;
          img {
            width: 82px;
            height: 82px;
            float: left;
          }
          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }
        .cart-list-con5 {
          width: 17%;
          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }
          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }
        .cart-list-con6 {
          width: 10%;
          .sum {
            font-size: 16px;
          }
        }
        .cart-list-con7 {
          width: 13%;
          a {
            color: #666;
          }
        }
      }
    }
  }
  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;
    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;
      span {
        vertical-align: middle;
      }
      input {
        vertical-align: middle;
      }
    }
    .option {
      padding: 10px;
      overflow: hidden;
      float: left;
      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }
    .money-box {
      float: right;
      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }
      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;
        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }
      .sumbtn {
        float: right;
        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
